Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad6dfcc3d7b377f…

MALICIOUS

PDF

93.0 KB Created: 2021-07-04 06:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1fe394f9efdfabf572e0bc3a5889f08 SHA-1: a4a1ac885e056de7391bc8fb48c2502718ef7552 SHA-256: 2ad6dfcc3d7b377ff470cc14b71a6adbc32e0f6ff7d1433993bbba2f48ea7607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised websites, designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure suggests potential for embedded JavaScript or other exploit mechanisms to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab8a636b5---56113126622.pdf
    • http://andrelandberg.com/userfiles/file/80879218685.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758f70963d3---91988878537.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609879a0cab17---kuzevonasedosefenel.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5f1c422fb1acefad675f0f7428b6210/xejonubiwi.pdf
    • https://unicon-msk.ru/data/files/buwekobuwote.pdf
    • http://lookkorea.net/userfiles/file/98419616352.pdf
    • https://kisikana.hr/userfiles/file/xunalitejutexiju.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b2ea8f4e66e32695ddab866ffb1105c5/wujekofisiten.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a68806c3---11780105988.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608265afe8a72---mugufabebijajasemutatezu.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/3162b442b4679d09f6a4d3ae44061435/87744410013.pdf
    • http://wildpflanzen-planung.de/file/79228787578.pdf
    • http://hpworld.hu/data/pic/Image/file/25551336881.pdf
    • http://llux.vn/uploads/files/kuleworojunexovopozo.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8998c69e---tozetutobegawunulew.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f8b59af0cc053fae6210542b17d65a1e/mokexol.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093a57a628f6---pajop.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7025c1c5d---lulelevologobawita.pdf
    • https://aawyx.com/sites/default/imageuser/file/topokusujinosan.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1dcef0ae---480384134.pdf
    • http://hitecds.com/userfiles/file/zuzofezakegasawad.pdf
    • http://krakow4you.pl/krakow/files/39201870334.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64b08ad79---jiseze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=once+upon+a+time+revenge+is+gonna+be+mine+lyrics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103bc.bin
f05d08bfcb959d7a567b5ab04fc6114bb8f3f6314c3bd6c86cc58902f7c80051
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 11164 bytes
font_01_sfnt_off00011db1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
font_02_sfnt_off000135c3.bin
2ed0e9bac021b20de645fe6de4715e3517b615e6df516fa545887f01b76dc1e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C3 19092 bytes